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Table 1 Baseline characteristics for the three groups

From: Heterogeneous burden of lung disease in smokers with borderline airflow obstruction

Variable Group 1
Ever-smokers, Normal FEV1,
\( \frac{\mathrm{FEV}1}{\mathrm{FVC}} \) < 0.7 and > LLN
(Discordant Group) (n = 161)
Group 2
Ever-smokers, Normal FEV1,
\( \frac{\mathrm{FEV}1}{\mathrm{FVC}} \)>  0.7
(n = 940)
Group 3
Never-smokers, Normal FEV1,
\( \frac{\mathrm{FEV}1}{\mathrm{FVC}} \)>  0.7
(n = 190)
P-value
Sex (% male) 70.8% 49.0% 37.9% < 0.001*
Race (% white) 89.4% 68.2% 70.7% < 0.001*
Current smoker (%) 32.5% 50.0% 0% < 0.001*
Age (mean ± SD) 69.3 ± 6.4 60.4 ± 9.7 56.6 ± 10.2 < 0.001
Smoking history in pack-years (mean ± SD) 48.3 ± 22.2 43.1 ± 27.3 Not Applicable 0.0
  1. *Chi-Square test
  2. ANOVA
  3. t-test